There+be 是一种常见的“表示存在”的句型。There+be 后可接名词或动名词。There must be rules for the changes.这些变化一定是有规则的。There is no knowing what may happen.谁也不知道将要发生什么事?另外,也常见 there to be 和 there being 的用法。如:It was unusual for there to be so few students in the classroom. There + be is a common “expression of existence” pattern. There + be available after the noun or gerund. There must be rules for the changes. These changes must be rules. There is no knowing what may happen. Who do not know what will happen? In addition, there are often there to be and there being usage. It was unusual for there to be so few students in the classroom.